Welan gum

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Welan gum
Identifiers
ECHA InfoCard 100.118.859
Properties
Appearance white to cream colored powder
Density 26.25 lbs/ft³ (bulk)
Hazards
Safety data sheet [1]
NFPA 704
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g., canola oil Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Welan gum is an exopolysaccharide used as a rheology modifier in industrial applications such as cement manufacturing.[1] It is produced by fermentation of sugar by bacteria of the genus Alcaligenes. The molecule consists of repeating tetrasaccharide units with single branches of L-mannose or L-rhamnose. In solution, the gum exhibits viscosity retention at elevated temperature, and is stable in a wide pH range, in the presence of calcium ion, and with high concentration of glycols.[2][3][4]

See also[edit]

References[edit]

  1. ^ US patent 5004506, "Welan gum in cement compositions", issued 2 April 1991, assigned to Merck & Co., Inc. 
  2. ^ "CP Kelco Welan Gum". CP Kelco. Retrieved 17 Sep 2010. 
  3. ^ "Welan gum". Colltec. Retrieved 17 Sep 2010. 
  4. ^ "Welan gum". Fritz Industries. Retrieved 17 Sep 2010. 

External links[edit]